What wakes us up?

Answer 1

A lot of things can wakes us up like noise, somebody is waking us up, sunlight or time, our body clock and of course the alarm clock.

Answer 2

Our internal body clock known as the circadian rhythm plays a major role in waking us up. When it detects light, it triggers the release of hormones like cortisol, which helps us feel more awake and alert. Additionally, external factors such as alarms, noise, or other people can also wake us up.

Answer 3

The hormones, adrenocorticotropin or the ACTH from pituitary gland and the cortisol from adrenal gland, send a message that alerts the brain to wake us up.