How do I breathe while sleeping?

🎓 Sleep is important. But how do you breathe?

Go for a walk outside in the morning, as soon as possible after waking up. Get some daylight in your eyes to set your circadian clock.
Avoid caffeine after midday, or altogether.
Schedule intense exercise in the earlier parts of the day.
Limit daytime naps, if possible.
Dim the lights in the evening, keep the bedroom dark.
Allow the last meal of the day at least 2-3 hours to digest before bed.
Avoid any amount of alcohol before bed.
Leave the phone outside the bedroom. Read a book and use a real alarm clock instead.
Don’t use the bed for work or similar things, only associate the bed with sleeping.
Try to maintain a steady sleeping pattern even during the weekend.

An active sympathetic nervous system hinders sleep.
Use slow, relaxed breathing with long exhales to switch to a parasympathetic state.
A slightly lower core body temperature helps to fall asleep.
Use light breathing with small inhales to increase blood flow to extremities and drop core body temperature.
Mouth breathing during the day causes mouth breathing and sleep apnea during the night.
Waking up with a dry mouth is a sign of mouth breathing.
Use sleep tape to maintain nose breathing while sleeping.