i've experienced similar things. i find that the ocd gets worse when i am tired. also, sometimes i find it easier to just go with the thing instead of challenging it, eg if i am about to go to bed and feel like i have to switch the light on and off a certain number of times, i do so if it's going to end up with me lying in bed not being able to sleep and eventually having to get up and do the light routine. that said, it's also good to challenge ocd thoughts.. i'm still working on that part!!