Feel much better now
Oh, having all you tasks and plans in a list of categorized items does incredible help. I listed all thoughts and plans for ITK (Imperial Toolkit, my codebase) I came up with and which were floating in my head. It is a good think to outsource the holding of such tasks. No I can simply forget everything and enjoy my actual freetime. It isn't much - in fact it was only a set of simple things I can do during phases of boredom or lectures. Some of them are totally no current tasks at all, but just stuff that needs to happen later. I feel better know, since I won't forget anything important this way. Good stuff.