Wear an eye mask. Light disrupts the normal circadian rhythms and signals the body that it's time to wake up. Keep out the noise. If necessary, wear earplugs. Set the temperature.
Optimal sleep happens in rooms that are cool - neither hot nor cold.
Ask your bed partner if you snore. Or if you live alone, have a friend spend the night with you. If you snore very loudly and wake up feeling very tired, you may be experiencing sleep apnea. Consult your doctor if this is the case. Avoid drinking alcohol late at night, especially if you find yourself waking up several times during the night.