😴
Complete Sleep Guide
The science of sleep and how to optimize your rest
🔄 Understanding Sleep Cycles
Stage 1 (NREM)
5-10 min
Light sleep, easy to wake. Body relaxes, heart rate slows.
Stage 2 (NREM)
20 min
Body temperature drops, brain waves slow. Preparing for deep sleep.
Stage 3 (NREM)
20-40 min
Deep sleep. Body repairs tissues, builds bone/muscle, strengthens immunity.
REM Sleep
10-60 min
Dreaming occurs. Brain processes emotions, consolidates memories.
A complete cycle takes ~90 minutes. Adults need 4-6 cycles per night (6-9 hours).
🫀 How Sleep Affects Your Body
🧠
Brain
Consolidates memories, processes emotions, clears waste
❤️
Heart
Blood pressure drops 10-20%, heart rests and repairs
💪
Muscles
Tissue repair, growth hormone released, energy restored
🛡️
Immune System
Produces cytokines to fight infection, strengthens defense
⚡
Hormones
Regulates cortisol, insulin, growth hormone, leptin/ghrelin
🔥
Metabolism
Balances blood sugar, controls appetite, burns calories
📊 Sleep Needs by Age
👶
Newborns (0-3 months)
Naps: Multiple naps
14-17 hours
👶
Infants (4-11 months)
Naps: 2-3 naps
12-15 hours
🧒
Toddlers (1-2 years)
Naps: 1-2 naps
11-14 hours
👧
Preschool (3-5)
Naps: 0-1 naps
10-13 hours
👦
School Age (6-13)
Naps: None
9-11 hours
🧑
Teenagers (14-17)
Naps: None
8-10 hours
🧑
Adults (18-64)
Naps: None
7-9 hours
👴
Older Adults (65+)
Naps: Optional short nap
7-8 hours
💡 Tips for Better Sleep
⏰
Consistent Schedule
Go to bed and wake up at the same time every day, even weekends
🌙
Dark, Cool, Quiet Room
Use blackout curtains, keep 65-68°F (18-20°C), use white noise if needed
📱
No Screens 1 Hour Before Bed
Blue light from phones/tablets suppresses melatonin production
☕
Limit Caffeine After 2 PM
Caffeine has a half-life of 5-6 hours and disrupts deep sleep
📖
Evening Wind-Down Routine
Reading, light stretching, or meditation signals your body to prepare for sleep
🍽️
Avoid Heavy Meals Before Bed
Eat 2-3 hours before sleep. If hungry, have a light snack
🏃
Exercise Regularly
Regular activity improves sleep quality. Avoid intense exercise close to bedtime
☀️
Sunlight Exposure
Get 15-30 minutes of natural light in the morning to regulate circadian rhythm
⚠️ Common Sleep Disorders
😫 Insomnia
Difficulty falling/staying asleep. Affects 30% of adults.
Treatment: CBT-I, sleep hygiene, medication if needed
😮 Sleep Apnea
Breathing stops during sleep. Causes snoring, daytime fatigue.
Treatment: CPAP machine, weight loss, surgery in severe cases
🦵 Restless Legs
Uncomfortable urge to move legs. Worse at night.
Treatment: Iron supplements, medication, reducing caffeine/alcohol
💤 Narcolepsy
Sudden sleep attacks, excessive daytime sleepiness.
Treatment: Medication, scheduled naps, lifestyle changes