Waking up on a cold morning, and realising that you don't need to get up for a while is one of life's pleasures.
Proposition B: (from Proposition A)
Waking up on a cold morning and realising you must get up now is a poor way to start the day.
Days that start poorly have a higher likelihood of sucking than other days
Today amply demonstrated Proposition B, and provided no evidence against proposition C.