psych sleep dream

light sleep easily woken up muscles less active eye movements slow sudden twitching

slower brain waves eye movements stop brain activity bursts body temp drops heart rate slows

slow delta brainwaves some faster waves

almost all waves are slow delta very hard to be woken up no eye movements disoriented upon wake

part of sleep cycle where rapid eye movement occurs behind the eyelids during dreaming

nightly pattern of deep sleep, light sleep and dreaming

non-rapid eye movement sleep

all incoming sensory info is blocked during rem

movement is prevented during rem sleep

human body rhythm that have a 24-hour cycle

controls circadian rhythms set by sunlight + other time clues found in middle of brain

daily rhythm triggered by the day-night cycle affected by jetlag, time zones, and work shifts

in tone with sleep wake cycle rises near end of sleep drops when prepping to sleep

rhythms that occur in a period of less than 24hrs e.g sleep cycle

chemical messengers transporting messages through the blood sleep resets them adrenaline governs fight or flight

involved in setting circadian rhythms produced in pineal gland triggered by darkness can be used as insomnia meds

small endocrine gland that produced melatonin

gland that produces a hormone that is secreted into the bloodstream

internal pacemakers; our biological clock

external cues in the environment that affect our biological clock

external cues that synchronize our biological rhythms main one is light

when biological rhythms are matched to their environment triggers

problems with sleeping at night that cause difficulties during the day

difficulty falling asleep waking up a lot during the night frequently lying awake during the night not feeling refreshed upon waking finding it hard to fall asleep during the day when tired feeling irritable and unable to focus