I need to sleep better

Right now I am in a tough sleep pattern.  I am going to bed earlier than I ever have regularly in my life.  We are getting up every day at 5:00.  It is only about five minutes a day earlier than last year, but I feel much more tired.  I'm sure part of it is my age, part of it is the time of year (serious lack of sunlight), and part of it is probably the general stress level of having three teenagers.  I've never fallen asleep well, although it used to be when I was exhausted, I could fall asleep easily.  Not so right now.  In addition, when Andrew comes to bed, I wake myself up to interrogate him...did you lock the front door (the dog goes out after I go to bed)...did you bring in Robert's phone and the vehicle keys...did this or that happen?  In spite of the fact that I remind him when I got to bed, the answer from Andrew is often no and out he goes again.  I am generally sleeping solidly from 10:30 until about 1:30...so three "good" hours.  At that point, I begin to wake up every hour, and generally I am awake at 4:30 and can't go back to sleep.  This is not at all conducive to feeling rested.  I've tried drinking tea before bed, I'm not usually on my computer before bed...I'm just not sure what to do.  Hopefully this is a phase, and I can begin to sleep at least seven hours soon!