How can I be pretty inaccurate telling what time it is without a clock, but I frequently wake up just a couple minutes before my alarm?

Question

If I was randomly asked what time it is, I wouldn’t be very accurate without looking at a clock. Likewise, if I was asked to guess when the clock hits exactly 8pm, I would be pretty far off. Yet I very frequently wake 2-3 minutes before my alarm goes off. How can my passed out brain be such an accurate time keeper?

In: Biology

Answer 1

I as well experience this, it is also likely because at some point I have been putting off taking bathroom break from sleep!