Have you accounted for ambient temperature being the cause of both? Being too cold to work and therefore feeling the need to wrap yourself in something warm? Alternately being warm making you less productive?
I've discovered that my productivity starts to drop off sharply above 73 Fahrenheit, for example.
This is the public group instrumental rationality diary for July 1-15.
Thanks to cata for starting the Group Rationality Diary posts, and to commenters for participating!
Next diary -- July 15-31
Immediate past diary -- June 1-30
Rationality Diaries archive