What do the “experts” know!

According to the “experts”, people get grumpier in winter because of the longer nights. The “experts” think people go to bed earlier and get up later, and so spend lots of hours awake and wishing they could get to sleep. What utter tosh. Most people go to bed and get up in the morning to the same weekly pattern all the year round. So the increased grumpiness is just make-believe.