I'm in my summer vacations and still wake up at work time, involuntarily

[Shawn Philips]

I want to stay up late in vacations to enjoy a bit more the nights. Yesterday I went to bed at 00:30, and today I (my brain) woke up at 6:30 and couldnt keep sleeping anymore.

My usual hour of waking up is always at 6, I start in my job at 7.

I understand my biologycal clock is set to wake up at 6, but If I stay up late my body still doesnt want to sleep 8 hours and prefers to stick to the daily routine even if it means waking up groggy and destroyed.

How can i change it?

[Princess Arabia]

The body is falling asleep and waking up all on it's own. It took hours of habitual sleep and waking at the same time to form that pattern, so it will take hours and repetition to undo that. Nothing you can do or not do but to allow for the changes to happen naturally. If bedtime was 10 p.m. and automatic waking was say 6.a.m and now going to bed is 12midnight and waking is still 6,a.m the body is programmed to wake at 6 a.m. You feel groggy because of less hours of sleep but that has to continue for awhile for the body to get used to. Only solution i see here is to wing it out and try not to be more than 2hrs over, only because the vacay isn't forever and will cut short anyway. Drink lots of water in the morning before anything else to try and balance out the grogginess.

[sholomar]

An unfortunate aspect of our evolutionary makeup is that the body likes routine, and a set carcadian rhythm really is better in the long run for you, unless you can get to the point where you can practical radical acceptance over not sleeping.

The older you get the harder it can be to sleep, so it might be best to go with it, and stick to a set sleep time. I realize when young people want "fun" and "nightlife" and such but these bad habits can potentially cause issues as one ages. 

Don't want to tell you to not have fun though.   Especially if you wake up to an alarm clock, it's uncanny how the body will wake up just a few minutes before it's set to go off, because the body sees the alarm clock as a negative stimulus. Maybe don't wake up to alarm clocks? 

My real advice: radical acceptance... accept if you are groggy and destroyed... if you resist it, or have a negative emotional reaction to it, you compound the issue. Relax into it and accept it's part of our specie's biological wiring. 

Edited 1 hour ago by sholomar