Some of us find anti-histamines before bed can be helpful for insomina (dont take them too often thou as Ive found one can build up tollerance to them and then need a stronger dose.. so say.. take only a couple of times per week). One anti-histamine which can be brought over the counter is Doxylamine Succinate Tablets which sometimes can be brought as a sleep Aid. Sometimes one only needs a very very low dose of it so take care how much you take eg I brought 25mg pills but found that I only needed about 6mg and it was very very hard to break the pills up that small). I wish I brought a lot smaller dose. I cant thou stress enough the importance of good sleep hygiene practices too (no exciting movies stimulating right before bed). Make sure the room is "completely dark" when trying to sleep (even lights on clock radios can affect sleep. I also found my electric blanket on while trying to sleep affected me from getting to sleep).