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Vol. 3 · Complete guide

Sleep: the complete guide

Sleep affects how you feel, think and cope with the day, and most adults have a run of poor nights at some point. This page brings together our free sleep articles in one place. Start with the main article on falling asleep more easily, then read by topic: evening routines, waking in the night, your body clock, and the daytime habits that shape how you sleep. The articles explain what public health bodies such as the CDC, the NIH and the NHS say, along with clinical guidelines from sleep medicine organizations, and each one links to its sources so you can check them. Everything here is general information, not a diagnosis. If poor sleep has gone on for weeks, affects your daytime safety (for example when driving), or comes with loud snoring, gasping or pauses in breathing, please talk to your doctor or healthcare provider.

Last reviewed by the Body Reset Guides editorial team

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Key things to know

  • Sleep experts recommend that adults regularly get 7 or more hours of sleep a night. (Source: Watson 2015)
  • For chronic insomnia in adults, the American Academy of Sleep Medicine recommends cognitive behavioral therapy for insomnia (CBT-I). (Source: Edinger 2021)
  • Your body clock (circadian rhythm) responds mainly to light and darkness, which is why light exposure and timing matter. (Source: NIGMS)
  • During the night you cycle through non-REM and REM sleep stages several times. (Source: NINDS)
  • Loud snoring, gasping or pauses in breathing during sleep can be signs of sleep apnoea, which the NHS says should be checked by a doctor. (Source: NHS)

Start here

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Frequently asked questions

How much sleep do I need a night?

Sleep needs vary with age and individual circumstances, and time in bed is not always time asleep. The CDC provides age-based guidance for adults and other age groups. Use that guidance as a starting point, not a calculator-generated prescription, and discuss persistent daytime sleepiness or sleep difficulties with your doctor.

Why do I wake up at 3am?

Waking at a particular clock time does not identify a single cause. Sleep includes repeated stages, and awakenings can occur for different reasons, including surroundings and everyday routines. Notice what is happening without diagnosing yourself. If awakenings are persistent, worrying or accompanied by other symptoms, discuss them with your doctor.

How to fall asleep faster without melatonin?

Consider your bedtime routine and sleep environment before looking for a product: a consistent schedule, a quieter room and less late-evening stimulation are common sleep guidance topics. None guarantees quicker sleep. If trouble falling asleep continues or worries you, ask your healthcare provider rather than escalating supplements or following rigid online rules.

Does stress affect sleep?

Stress and sleep difficulties can occur together, but noticing both does not establish what is causing your experience. You might note evening worries, routines and interruptions as context for a conversation. Persistent difficulties deserve support from your healthcare provider; a general article cannot identify a personal cause or prescribe an approach.

What is a sleep cycle and how long does it last?

A sleep cycle is a progression through different sleep stages, including non-REM and REM sleep. Cycle length varies within a night and between people, so a fixed duration is a simplification. A calculator can suggest possible clock times, but it cannot measure your stages or guarantee how you will feel.

Is sleeping 6 hours enough?

For most adults, six hours is below the general sleep duration guidance described by the CDC. An occasional short night and a regular pattern are different situations. How you feel does not establish a diagnosis. Discuss persistent tiredness, disrupted sleep or difficulty allowing enough time for sleep with your healthcare provider.

Sources

How we choose sources