Sleep Restriction Worksheet: Build a CBT-I Sleep Window from Your Diary Data
A core CBT-I tool that uses your own sleep diary data to set a consolidated sleep window, rebuilding your drive to sleep and the link between bed and sleep.
Reviewed by Michael Callans, MSW 
About this tool
Sleep restriction therapy is one of the most effective components of cognitive behavioral therapy for insomnia (CBT-I), the recommended first-line treatment for chronic insomnia. Developed by Arthur Spielman, it works on a counterintuitive principle: spending less time in bed, not more, often leads to deeper, more consolidated sleep. When you lie awake for hours, the bed becomes associated with frustration and wakefulness. Restricting time in bed rebuilds your natural sleep drive and re-establishes the bed as a place for sleep.
The method uses your own data. From a week or two of sleep diary records, you calculate your average total sleep time: the hours you actually sleep, not the hours you spend in bed. Your initial sleep window is set close to that average (most protocols use a floor of around five to five and a half hours, never less). You pick a fixed wake time and count backward to set your bedtime, and you keep that window every day, including weekends. As your sleep becomes more efficient, you gradually extend the window.
Sleep efficiency is the key metric: total time asleep divided by total time in bed, as a percentage. When efficiency stays high (commonly 85 to 90 percent or more) over several nights, you add 15 to 30 minutes to the window. If efficiency drops, you hold or trim it. Over weeks, this tightens the relationship between being in bed and being asleep.
Sleep restriction is demanding. It usually increases daytime sleepiness in the first week or two before sleep improves, which is why it is best done with guidance from a CBT-I trained clinician, and why it requires real caution. See the safety note before beginning.
Your sleep window is not a permanent limit, it is a starting point that moves as your data changes. Compare each week's average sleep efficiency to the prior week: efficiency at or above about 85 to 90 percent on most nights usually means you are ready to add 15 to 30 minutes to the window, while efficiency below that means holding the window steady or trimming it slightly. A rough night here and there is normal while the window is tightening, so judge progress by the weekly average, not any single night.
Sleep restriction is not the right first step for everyone, and it works best with support. If insomnia is layered with untreated sleep apnea, a mood or anxiety condition, chronic pain, or irregular shift work, a therapist or sleep medicine clinician trained in CBT-I can tailor the protocol and check on your daytime functioning as you go. You can search the Psychology.com therapist directory for someone who offers CBT-I, and if anxiety seems tangled up with your sleep trouble, the Insomnia Test can help clarify what you are dealing with before you start.
References
- Spielman AJ, Saskin P, Thorpy MJ. Treatment of chronic insomnia by restriction of time in bed. Sleep. 1987;10(1):45-56.
- Edinger JD, et al. Behavioral and psychological treatments for chronic insomnia disorder in adults: an American Academy of Sleep Medicine clinical practice guideline. J Clin Sleep Med. 2021;17(2):255-262.
Cite this source
Psychology.com. (2026, September 15). Sleep Restriction Worksheet. Psychology.com. https://psychology.com/tools/sleep-restriction
Sleep Restriction Worksheet FAQ
What is sleep restriction therapy?
It is a CBT-I technique that limits time in bed to roughly the time you actually sleep, which strengthens your sleep drive and rebuilds the link between bed and sleep. As sleep consolidates, the window is gradually extended.
Isn't less sleep a bad thing?
Sleep restriction limits time in bed, not your need for sleep. In the first week or two daytime sleepiness often increases, but most people then sleep more deeply and fall asleep faster. It is a short-term step toward better sleep.
Is it safe to do on my own?
Sleep restriction temporarily increases sleepiness, so it can affect driving and concentration. It is best done with a CBT-I trained clinician, and certain conditions (such as bipolar disorder, seizure disorder, or untreated sleep apnea) require professional guidance first.
How long until it works?
Many people notice improvement within two to four weeks, but it varies. Consistency with the fixed window and wake time is what makes it work.
How is sleep restriction different from sleep hygiene?
Sleep hygiene covers habits like caffeine timing, light exposure, and a consistent routine, and helps most people sleep somewhat better. Sleep restriction is a structured CBT-I technique that shrinks your time in bed to match your actual sleep time, then expands it gradually as efficiency improves. Many people use both together, but sleep restriction targets chronic insomnia more directly and tends to work faster.
Is this sleep restriction worksheet free to use?
Yes. The worksheet, its sleep window calculations, and the printable PDF are free on Psychology.com. You will need your own week or two of sleep diary data first, since the window is calculated from your actual average sleep time rather than a general formula.