Sleep

Is it just part of growing older to have trouble sleeping?  Right now the only way I can sleep is propped up on 3 pillows or sitting semi-upright in the recliner.  I fall asleep easy enough but wake about 90 minutes later. Some time between midnight and 4 am I will sleep 3 uninterupted hours.  I have some arthritic pain in my shoulder that makes it difficult to get comfortable but I hate to take aspirin or ibuprofen every night, (Tylenol does nothing for it.)  I can take a nap during the day and that helps but oh how I long for the nights of blissful uninterupted sleep!!