Hi I Take Topamax And Pristiq ... I Find That

hi I take Topamax and pristiq ... I find that if I take them after a certain time I cant sleep all night ... im trying to find out when I should take them to get a better sleep and which one is it that is the one that has something in it to keep me wide awake ...... also since I began to take them I feel sometimes I cant remember details or anything and feel like im in a world of my own its strange how it happens . it can be scary .