1.) Stay up sitting at the computer doing nothing much (but possibly putting together a Sapphire and Steel related design and uploading it to Redbubble).
ii.) Stay up sitting at the computer watching at least another episode of Stargate SG-1
c.) Go to bed.
1 is obviously the easiest. ii would be nice (I've watched three episodes today, and more wouldn't go amiss right now). c, bizarrely, I'm not keen on since it involves effort, i.e. getting up from the sofa. Also, I've spent about five hours in bed already today, and I feel that any more would be kind of wrong.