You cannot safely or realistically sleep 8 hours in 3 hours
Use a 3-hour nap or sleep block to get the maximum possible rest
Keep a strict sleep schedule every day
Go to bed earlier tonight to increase total sleep
Reduce caffeine, nicotine, and alcohol before bed
Make your room dark, quiet, and cool
Turn off screens at least 30 minutes before sleep
Use a short wind-down routine such as breathing or meditation
Avoid heavy meals right before sleeping
If you are severely sleep-deprived, prioritize more sleep as soon as possible
If you often need very little sleep, consult a doctor