The optimal temperature in a bedroom should be between 67 F and 60 F which helps a person fall asleep easier and stay asleep.
Being too hot can cause your body to stay awake and not want to fall asleep and I found that after I've started keeping my bedroom temperature at 65 F.
The cooler temperatures help me fall asleep faster and stay asleep.
But if you're too cool and uncomfortable at that temperature then you can raise the temperature or lower the temperature to what makes you comfortable.
My brother cannot sleep unless the temperature is 70 F in his house and bedroom but for me when I stay at his place that temperature is too warm for me to sleep.