G-chatting as you are falling asleep, resulting in mostly incomprehsnsible half thoughts and many typos. Can also be seen on other chat / messaging applications.
Sleepchatting conversation:

3:33 AM Guy: have a good night
Girl: nihjy
Girl: night
typov
bvc im asleep
3:34 AM Guy: ha, k
3:35 AM Girl: uj hih
3:36 AM Guy: go to sleep
Get the Sleepchatting mug.