I like to try and journal when I get home from T, which sometimes isn't for a few hours. Lately, as most of my sessions have been hard ones, I've taken to doing an audio journal - talking to the voice memo app on my phone - so I can hold on to whatever it is I want to think about. Sometimes the audio is long, like 10 minutes, as I ramble on, other times it's just 2-3 minutes and I just speak the big ideas. That way, when I do have time to sit down, be it later that day or the next day, I can go back and listen to my audio notes and journal from there.

Oh, and as long as I'm not too much of an emotional wreck, I actually do the recording while I'm driving - it's all hands free, like I was talking on the phone. On days when I'm a wreck, I sit in the parking lot for a few minutes and record before driving away.