Interferes with sleep because the eyes need darkness to know it's time to sleep.
Light
Doing this too close to bedtime or for too long reduces sleep pressure.
Napping
Body's energy
Do this every morning and night at the same time in order to set the body's master clock which times all bodily functions.
Get up and go to bed
Doesn't allow the body to rest during sleep.
Eating too close to bedtime.
Alcohol
Debris
Adolescents require this many hours of sleep opportunity to get the right amount of sleep in order to restore energy, consolidate memories, clean waste from the body, and regulate emotions and weight.
10-13 hours
This stimulating substance has a long half-life of 5-6 hours.
Caffeine
Nicotine
These get repaired (like an internal mechanic)
Damaged cells and tissues
Create this for better sleep every night in order to send clear signals to the body and brain that it is time for bed.
A bedtime routine
These emotional states produce cortisol/adrenaline and keep the body awake and on alert.
Stress and anxiety
This keeps people from sleeping deeply.
Noise
This gets organized and stored (like how a computer save stuff in folders)
Information
Shut these down 2 hours before bedtime since the brain needs to see darkness to register that it is nighttime.
Electronics
Doing this too close to bedtime will make it difficult for the body to cool down properly.
Exercising
This hinders the body from knowing when it's time for bed.
Lack of bedtime routine
This is maintained (like energy efficient appliances)
Healthy metabolism
Place these outside of the bedroom area during the night in order to eliminate the temptation to peek at them and ruin your sleep.
Electronics