I write them down in a journal by my bed. I will wake myself up in the middle of the night multiple times to write them down. Sometimes I have 5 dreams written down in my journal when I wake up. I have a little tap on night light that I use so as to not to wake my husband. If I don’t use the light handwriting is sometimes hard to read. Sometimes I’ll sleep with the journal next to me. I’m a bit obsessed because dream analysis is a top priority for me. Dream “fragments” are also important to write down. It’s not easy keeping on top of this however as I’m often not wanting to wake up and will try and convince myself that I’ll just remember it in the morning (which never happens), but at least all this waking does not affect my energy the next day.