Terms for describing sleep
Sleep Diary
Related terms: Sleep log, Sleep record sheet
A sleep diary is a record kept over several days noting the time of going to bed, the perceived time of falling asleep, times of waking during the night, final wake-up time, and daytime sleepiness.
Reviewed by Korean Medicine Doctor Choi Yeon-seung · Last updated 2026-08-26
Meaning and Distinctions
What is a sleep diary?
It is more helpful to look at sleep patterns and lifestyle factors over several days than to focus on a single worst night. A sleep diary is a record kept over several days of the time you went to bed, the time you felt you fell asleep, times you woke up during the night, your final wake-up time, and daytime sleepiness.
- Easily confused terms
- This is different from simply collecting data from a wearable device. You also record caffeine intake, alcohol consumption, naps, medications taken, and how you felt the following day.
- Why this is checked during medical evaluation
- difficulty falling asleepnighttime awakeningor early awakening, it allows us to see which patterns repeat and compare what has changed after treatment.
- What to write down for your visit
- Please do not worry more about your sleep by trying to measure it exactly to the minute; simply record it in the morning based on what you remember.
Sleep and Mind Glossary
Compare similar terms here
You can check the brief meaning first and then proceed to the detailed explanation.Sleep Onset LatencySleep onset latency is the time it takes to actually fall asleep after lying down in bed. To distinguish the patterns of insomnia, it is necessary to record the time taken to fall asleep, nighttime awakenings, and the wake-up time, rather than simply looking at the bedtime.Nighttime AwakeningNighttime awakening refers to waking up one or more times during the night after falling asleep. In addition to the number of awakenings, the time it takes to fall back asleep and the level of fatigue the next day are also monitored.Early Morning AwakeningEarly morning awakening is a form of insomnia where you wake up much earlier than your intended wake-up time and find it difficult to fall back asleep.
Read More
Check guides where this term is used
- Condition GuideChronic InsomniaInsomnia is a state where it is difficult to fall asleep, or you wake up frequently or too early despite having the opportunity to sleep, and your concentration, mood, or work performance the next day is affected. We record not only the sleep onset time but also nighttime awakenings, final wake-up time, daytime sleepiness, and fatigue. Reduce the time spent enduring while checking the clock, and recover a consistent wake-up time and daytime concentration. If you experience heavy snoring, sleep apnea, drowsy driving, agitation where you do not feel tired despite lack of sleep, or thoughts of self-harm, please seek the relevant medical evaluation first.→
- Condition GuideSleep disorderSleep disorders do not only refer to insomnia. They include snoring, sleep apnea, leg discomfort, abnormal behaviors during sleep, excessive daytime sleepiness, and circadian rhythm misalignment. The scope of Korean herbal medicine treatment can be determined only after first categorizing the type of sleep problem. The goal is to regain safe daytime alertness and a sense of recovery rather than just focusing on sleep duration, and to ensure necessary sleep tests are not missed. In cases of risk of drowsy driving or workplace accidents, sleep apnea, or injury due to abnormal behaviors during sleep, a professional sleep evaluation takes priority.→
- Medical GuideWhat should I prepare before my sleep and mental health consultation?For about one week, record the time you went to bed, the time you fell asleep, the number of times you woke up, and your wake-up time. For anxiety or panic, record the triggering situation, the most severe physical reactions, and activities you have started to avoid. Please prepare your prescriptions, medication envelopes, and diagnosis or test results, but you do not need to explain every emotion perfectly. Just let us know one part of your daily routine you most wish to recover.→
- Sleep & Mind ColumnWhat is the difference between difficulty falling asleep, waking up frequently, and waking up too early?→
Evidence and Update Information
The following materials were referenced to verify the basis and scope of the definitions and treatment explanations.