Dmytro Zinkevych / Shutterstock

A study has shown how the body temperature naturally dips at night, beginning about two hours before sleep, reaching its lowest point around 4 a.m. That’s why artificially raising your temperature by taking a bath, hot shower, or going into a sauna may be a good idea. It will fall around bedtime, encouraging rest. The drop in temperature is a signal to your body that it’s time to sleep.