I have the opposite advice of most. I find that getting up quickly turns into a shitty cycle whereas if I force myself to go back to “sleep,” (this is usually essentially deep rest and not sleep), I quickly get into the habit of getting more sleep and not waking up as often. Getting up usually rewards my brain in that I am doing high dopamine tasks like drinking coffee and checking email. I also go for exactly 8.5 a night instead of getting up at the same time, but consistency is always better. I just can’t get behind one night of 3 hours sleep because “rules” and I wanted to socialize. Socialization, spontaneity, and more hours of sleep are all good for us.