Time to sleep.

So somedays i go to bed at around 04:00 AM. Yeah It's a bad habit. But at that time I hardly feel sleepy anymore and the birds are already wide awake. So what If 04:00 AM should be our actual time to get up? I get an Energy boost at that moment so It may work. Though, when should you go to bed??? Follow the birds. You wake up when they do AND you go to bed when they stop making noice. I haven't figured out yet when they go to sleep though around 04:00 AM they start chirping again, time to shine.