So what you should do is go to bed at 21:00 to 23:00 pm, no late than midnight. Do not play mobile computer or watching television during the 30-60 minutes before bedtime.
Therefore, the State should do is go to bed: 21.00-23.00 range do not sleep over late night till midnight. Do not play on mobile computers or watch TV over 30-60 minutes before bed.
Therefore a lion to do is to go to bed at 21.00 - 11:00 pm no late than not to play at midnight mobile computer or watch television during the 30 - 60 minutes before sleeping