sedation
"I'm 73 years old now and started taking Phenergan a long, long time ago.  For the last 35 years I've taken a little more than 1/2 of a 25 mg tablet just about every night, about 3-4 hours before I want to go to sleep.  Although I wake up about 3 times/night, I fall back to sleep easily and sleep for 8 to 9 hours. It is very "drying" but I consider this worth the good sleep. Often I combine it with 0.5 mg melatonin."