College, depression, excitement, & what to do?

I'm starting back to school on July 12 to get my Associates in Applied Sciences, studying Massage Therapy & Natural Healing. I'm way excited & happy about this, but I am starting to feel "weepy", like crying at sad parts of movies, happy/sweet commercials, etc. I'm having trouble getting to sleep until after the sun comes up & then I'm sleeping till 2 in the afternoon. I think it's all caused by the stress (good stress) of going back to school, but I need to get in in check before school starts. Any advice on what to do, how to cope with this weird sleeplessness/weepiness? I do not want to go to the doc & get meds, I don't like them & there's risk of addiction & you have to come off them slowly, etc I just really want to be able to get thru this naturally. Thanx for your help :)