In the interest of good animal detective work..a few questions need to be answered.
1: Did you find any little stains on the sheet..indicating a mouse had left any saliva or juices..? (drooling) A mouse delivering a bunch of seeds..deposited one at a time..would probably have left some signs.
2: Did you find any mouse hair around the "site" which might confirm a mouse presence..?
3: Did your husband ever "Short Sheet" your bed in the early years of your marriage...?
I'm thiking your husband is just showing his affection ..on
Valentines Day by ...Busting your chops.
NB