Keep your bedroom quiet. Dripping faucets, noisy radiators, sirens, barking dogs, loud stereos, and late-night revelers are common rest inhibitors. If sounds cannot be eliminated altogether, you can create a soothing atmosphere by setting the tuner of your FM radio between any two stations. The pseudo white noise will mask unwanted sounds and promote sleep. Using dark fabric to block windows or the rim of a door can significantly reduce the amount of light leaking into the bedroom.
Eyeshades can also do the trick.
The ideal temperature for sleeping is 65 degrees Farenheit. A hot bedroom or too many blankets or bedclothes may disturb sleep and even induce nightmares. A cold room can be just as disruptive as you'll wake up shivering. An ideal relative humidity level for the bedroom is between 60 and 70 percent. You may want to buy a humidifier or a dehumidifier depending on your needs.