A colleague at work told me about a phone app that records your sleep patterns. I was sceptical but bought in anyway and tried it out last night. When you go to bed you start the app and put the phone on the mattress. Apparently it works by recording your movements and calculating the different phases of your sleep.
I don’t know how accurate it is and it isn’t configured to take Tourettes into account but the graph it produced this morning seems to suggest that I’m waking up about every hour and sleeping quite lightly.