The reason it's hard for most people to get out of bed on a cold morning is because the weather is cold, the room may be a bit chilly and our bodies just want to rest and hibernate.
I have a hard time getting out of bed in the morning myself and some of the problem is lack of sunlight in the morning and some of the reason is because my room is a bit drafty and chilly and so I want to stay under my warm blanket.
I have my furnace thermostat set to warm the house up a few hours before I wake up because although I sleep better when it's a bit chilly I cannot get up and out of my warm blanket when I'm shivering a bit.
So I have the house warmed up a few hours before I wake up.
This makes it also so I don't want to linger in my bedroom where I keep it warmer than the rest of the house.
Your body produces the sleep hormone, melatonin, as it gets darker out, setting you up to fall asleep at night.
But since you're not exposed to the early morning light in the winter a cue for the body to stop melatonin secretion it's harder to wake up in the morning.
Some ways to help you get out of bed on a cold morning include.
Set a timer on the central heating.
Decide what to wear the night before.
Set a calming alarm.
Enjoy a warm breakfast.
Have something to look forward to.
Don't allow yourself to reason with yourself.
Consider buying a light box.