It has been noticed since the time immemorial that cognitive biases have a nasty tendency of being invisible to self (note the proverbial log in one's eye). Uncovering their own blind spot is probably the hardest task for an aspired rationalist. EY and others have devoted a number of posts to this issue (e.g. the How To Actually Change Your Mind sequence), and I am wondering if it is bearing fruit for the LW participants.
To this end, I suggest that people post what they think their current rationality blind spot they are struggling with is (not the usual sweet success stories of "overcoming bias"), and let others comment on whether they agree or not, given their impressions of the person here and possibly in real life. My guess is that most of us would miss the mark widely (it's called a blind spot for a reason). Needless to say, if you post, you should expect to get crockered. Also needless to say, if you disagree with a person pointing out your bias, odds are that you are the one who is wrong.
(Who, me, go first? Oh, I have no biases, at least none that I can see.)
I think I have done that at times, although in the form of getting up, turning on my computer, writing the thoughts, saving them, and then trying to go back to sleep. That involves significantly more activity than a bedside notebook though, and that activity might itself be waking me up. Simplifying the number of steps necessary might help me get additional sleep, so it's worth a try.
When I think of something I want to record quickly, and my computer isn’t at hand, I just record it as a text note or voice memo on my phone. (I have a dumbphone, but it still has voice memo capabilities.) I keep my phone by my bed when I sleep, and have Voice Memos set to a shortcut on the phone, so if I wake up with a thought, It’s really easy to record it. I haven’t actually re-listened to any of the ideas, since I know none of them are urgent, but just knowing that the thought is safely recorded and that I could theoretically continue working on it later is enough for me to relax and stop worrying about it. (I also back up the recordings to my computer occasionally for further peace of mind.)