Sleep.
Yesterday I went to sleep around 10:48.. woke up in the middle of the night. 3:00, and then kind of slept till 5:45.. And then it was hard to go to sleep. Now in the morning I don’t feel as refreshed and charged. Even a bit heavy, sensation around eyes and head.
The ideal sleep is when I slept at 10:00 and directly woke up at 5:45. Deep sleep. If not enough sleep, it affect the sharpness of focus. I can still work for the whole day, the productivity might be less. And strong thinking maybe missing.
One remedy that I apply and can apply is go to sleep in the afternoon, sometime I am able to recharge myself, sometime not. Sometime as a hit and trial approach I also try chai. If I am tired and not stressed i should be able to go to sleep next day quickly.
Yoga nidra is good option to fall back and relax. And quickly go to sleep, vipassana is another option if the sleep is not coming.
Stop doing other stuff and go to sleep at 9:45-10. Use yoga nidra, breath to relax the body, put earplug, start vipassana, if wake up in night, relax the body, do yoga nidra, and start vipassana. Incase you didn’t have enough sleep anyway and feeling a bit drowsy, take a nap in the afternoon.
Wake up at 5:45. Do your daily practices. Play with this time to make it more appropriate. Now go though the day up to noon and then if require take the nap.
Check the common solution for the sleep people found over internet.