How can i fix a delayed sleep phase?

Slowly: Our body's sleep mechanisms don't like abrupt change. Depending on how many hours your phase delay is, it can take weeks/months. First bit of advice is to slowly shift sleep/wake times. Try 15 minute changes, and then don't 'graduate' to another 15-min shift until you're falling asleep w/in 30 min at your new bedtime. Melatonin at night may help. Bright light in morning; dark as possible at night.