Why..!!

[Scrumpy]

.. is it that when you go to bed .. very tired. and your head sinks deep into the pillow...
 You start thinking about what you are going to have for lunch tomorrow.!!
What you need on your shopping list and what was the name of that star in that drama you liked so much...!!!!!!!!

[klondike]

I don't usually have any problem nodding off. It's getting to bed first that's tricky.

[muddy]

Me too.
Then there are those tedious bathroom rituals teeth cleaning etc etc 

[Mups]

I'm much the same as you, Scrumps.

I start yawning, and slowing down as it gets late,  so I go and let the dogs out for a bedtime wee,  then do my ablutions and then climb into bed.   But I suddenly don't feel tired anymore!
So I start reading my book until my glasses slide down my nose,  the book falls on the floor, and my neck hurts where its been at a silly angle for half an hour.  
So I turn off the bedside light,  lay down,  and . . . . . . .  start thinking about the next day!!