Most people have heard the phrase "sleep hygiene" and have a vague sense that it involves going to bed at a reasonable hour and not staring at their phone until midnight. That is not wrong, but it is incomplete. Sleep hygiene is a specific set of evidence-based practices designed to support the biological processes that make sleep possible, and understanding why each practice matters makes it considerably easier to follow through on them.

It is also worth saying upfront: sleep hygiene is not a character test. Poor sleep is not a sign of laziness or lack of discipline. Sleep is a biological process governed by two interacting systems, and when those systems are disrupted, good intentions are not enough to fix them. Understanding the systems is the starting point.

Sleep is regulated by two processes working together. The first is the circadian rhythm, the roughly 24-hour internal clock that tells your body when to be alert and when to wind down. It is primarily set by light exposure, particularly morning light, and it governs the release of melatonin in the evening. The second is sleep pressure, sometimes called the homeostatic sleep drive, which is the accumulating need for sleep that builds the longer you are awake. The longer you stay up, the stronger the drive to sleep becomes.

Healthy sleep happens when these two systems are aligned: your circadian rhythm is signaling that it is nighttime, and your sleep pressure has built up enough to carry you through a full night. Sleep hygiene practices are largely about protecting both systems from disruption (Morin & Espie, 2003).

When the circadian rhythm is thrown off by irregular schedules, bright light at night, or shift work, the timing signal gets confused. When sleep pressure is depleted by long naps or spending excessive time in bed awake, the drive to sleep weakens. Either disruption makes it harder to fall asleep, stay asleep, or feel rested in the morning.

The Cleveland Clinic defines sleep hygiene as the habits and practices that make it easier to fall asleep and stay asleep, describing it as the "prep work" that protects sleep quality (Foldvary-Schaefer, 2026). The VA/DoD Clinical Practice Guidelines for insomnia describe sleep hygiene as a foundational component of insomnia treatment, noting that while it is rarely sufficient on its own for chronic insomnia, it is a necessary part of any comprehensive approach (VA/DoD, 2019).

The core practices are well established and consistent across sources.

Keep a consistent sleep and wake schedule. This is the single most important sleep hygiene practice. Going to bed and waking up at the same time every day, including weekends, anchors the circadian rhythm and strengthens the sleep-wake cycle. Sleeping in on weekends feels restorative but actually delays the circadian clock and makes Monday mornings harder. The Cleveland Clinic's sleep medicine specialists are direct on this point: consistency is the foundation everything else is built on (Foldvary-Schaefer, 2026).

Use the bed only for sleep and sex. This practice comes from stimulus control therapy, one of the most effective components of CBT-I (cognitive behavioral therapy for insomnia). The principle is straightforward: the brain learns associations. If you spend hours in bed watching television, scrolling your phone, or lying awake worrying, the bed becomes associated with wakefulness and arousal rather than sleep. Over time, getting into bed can actually trigger alertness rather than drowsiness. Reserving the bed for sleep retrains that association (Morin & Espie, 2003).

Create a wind-down routine. Sleep does not switch on like a light. The transition from wakefulness to sleep takes time, and the hour before bed matters. Dimming lights, avoiding screens, doing something calming like reading or gentle stretching, and following a consistent sequence of pre-sleep activities all signal to the nervous system that sleep is approaching. The Cleveland Clinic recommends beginning this wind-down process about an hour before the intended sleep time (Foldvary-Schaefer, 2026).

Keep the bedroom cool, dark, and quiet. Core body temperature drops during sleep, and a cool room supports that process. Most sleep researchers recommend a bedroom temperature between 60 and 67 degrees Fahrenheit. Darkness matters because light suppresses melatonin production, even through closed eyelids. Blackout curtains and eye masks are not indulgences; they are tools.

Avoid caffeine in the afternoon and evening. Caffeine has a half-life of roughly five to seven hours, meaning that a cup of coffee at 3 p.m. still has half its stimulant effect at 8 or 9 p.m. For people who are sensitive to caffeine, or who metabolize it slowly, the effects can last considerably longer. The Cleveland Clinic recommends cutting off caffeine intake in the early afternoon (Foldvary-Schaefer, 2026).

Avoid alcohol close to bedtime. Alcohol is sedating, which is why many people use it to fall asleep. But alcohol disrupts sleep architecture, particularly REM sleep, and causes broken, interrupted sleep in the second half of the night. The result is that alcohol-assisted sleep feels like rest but is not restorative (Foldvary-Schaefer, 2026).

Avoid eating large meals close to bedtime. Digestion is an active process, and a full stomach can cause discomfort, acid reflux, and elevated core temperature, all of which interfere with sleep onset. The Cleveland Clinic recommends finishing eating at least three hours before bed (Foldvary-Schaefer, 2026).

Limit naps, especially late in the day. Napping depletes sleep pressure, making it harder to fall asleep at night. If a nap is necessary, keeping it to 20 minutes or less and taking it before 2 p.m. minimizes the disruption to nighttime sleep (Foldvary-Schaefer, 2026).

Exercise regularly, but not too close to bedtime. Regular physical activity improves sleep quality significantly, but vigorous exercise within two hours of bedtime can elevate heart rate and core temperature in ways that delay sleep onset. Morning or early afternoon exercise is ideal.

Manage light exposure deliberately. Bright light in the morning, particularly sunlight, is one of the most powerful anchors for the circadian rhythm. Getting outside within an hour of waking, or using a light therapy lamp in darker months, helps set the biological clock. Conversely, avoiding bright and blue-spectrum light in the evening, including from phones, tablets, and televisions, protects melatonin production.

Good sleep hygiene is necessary but not always sufficient. The Cleveland Clinic identifies several signs that sleep problems may require more than behavioral adjustments: taking more than 20 minutes to fall asleep consistently, waking frequently during the night, feeling unrefreshed after a full night in bed, relying on caffeine or naps to function during the day, difficulty concentrating, irritability, or getting sick more often than usual (Foldvary-Schaefer, 2026).

When these signs persist despite consistent sleep hygiene practices, the problem is likely chronic insomnia, which has a different mechanism and requires a different intervention.

Cognitive behavioral therapy for insomnia, known as CBT-I, is the first-line treatment for chronic insomnia according to multiple clinical guidelines, including those from the American College of Physicians and the VA/DoD (VA/DoD, 2019). It is more effective than sleep medication in the long term and does not carry the risks of dependence or rebound insomnia that medications can produce.

CBT-I addresses the thoughts and behaviors that perpetuate insomnia, not just the surface-level habits. It includes several specific components.

Sleep restriction therapy is one of the most counterintuitive and most effective. The idea is to temporarily limit time in bed to match actual sleep time, which consolidates sleep and rebuilds sleep pressure. It is uncomfortable at first, but it is highly effective at breaking the cycle of lying awake in bed for hours (Morin & Espie, 2003).

Stimulus control, described above, retrains the association between the bed and sleep. Cognitive restructuring addresses the unhelpful beliefs about sleep that often develop in people with insomnia, such as catastrophizing about the consequences of a poor night's sleep, which itself creates the arousal that prevents sleep. Relaxation training, including progressive muscle relaxation and diaphragmatic breathing, reduces the physiological arousal that keeps the nervous system activated at bedtime.

The VA/DoD guidelines note that CBT-I is effective for a wide range of patients, including those with co-occurring conditions like depression, anxiety, PTSD, and chronic pain, and that it should be offered before or alongside medication rather than after medication has failed (VA/DoD, 2019).

Sleep and mental health are bidirectional. Poor sleep worsens anxiety, depression, and emotional regulation. Anxiety, depression, and stress worsen sleep. This cycle is one of the most common patterns seen in mental health treatment, and it is one of the reasons that addressing sleep is often a central part of therapy rather than a side issue.

For people with ADHD, sleep problems are particularly common. Barkley notes that delayed sleep phase, difficulty falling asleep, and restless sleep are frequently reported by people with ADHD, and that these problems are not simply a consequence of stimulant medication but are often intrinsic to the condition itself (Barkley, 2015). Addressing sleep hygiene and, when needed, pursuing CBT-I can make a meaningful difference in daytime functioning for people with ADHD, sometimes as much as medication adjustments.

The bottom line is that sleep is not a passive state. It is an active biological process that requires the right conditions to unfold. Sleep hygiene is the practice of creating those conditions. When it is not enough, CBT-I provides a structured, evidence-based path forward. Either way, sleep problems are treatable, and they are worth treating.

If you are struggling with sleep and wondering whether it might be connected to anxiety, depression, ADHD, or another condition, the providers at Hope Springs Behavioral Consultants are here to help. Request an appointment to get started.

References

Barkley, R. A. (2015). Attention-deficit hyperactivity disorder: A handbook for diagnosis and treatment (4th ed.). Guilford Press.

Foldvary-Schaefer, N. (2026, April 20). Rest easy: 8 ways to improve your sleep hygiene. Cleveland Clinic Health Essentials. https://health.clevelandclinic.org/sleep-hygiene

Morin, C. M., & Espie, C. A. (2003). Insomnia: A clinical guide to assessment and treatment. Springer.

U.S. Department of Veterans Affairs & Department of Defense. (2019). VA/DoD clinical practice guideline for the management of chronic insomnia disorder and obstructive sleep apnea. https://www.healthquality.va.gov/guidelines/CD/insomnia/