The best mantra for night sleep is dedicated to Sri Krishna. You need to first stop all activities 1 hour before going to sleep. Below is the mantra for night sleep.
The mantra should be chanted after switching of television, all kinds of screens and mobile before night sleep. You should meditate for 10 minutes before going to sleep.
Now sit facing east. Chant the mantra 108 times. Only think about Sri Krishna playing his flute.
Next day, wake up early in the morning just before sunrise and meditate on rising sun. Offer water to rising sun by pouring it out of your hands.
Do not sleep during the day time.
The person chanting the mantra should plant herbs like tulsi, mint etc and take care of it. The person should also plant Parijata tree and neem tree in your own plot or in an abandoned land and take care of it.