If my upholstered bed is in front of my window...

[Karbea]

Would it look better if the head board and blind are in the same fabric. I was thinking at night it could look great (when the blind is closed), or would it look too much?

[7to25]

I think that the headboard fabric being stretched due to upholstery and the blind fabric being looser, it would look a bit odd.

[7to25]

Does the bed have to be in front of the window?
Avoid red fabrics as they will fade in strong sunlight.

[poocatcherchampion]

... you will be cold at night.

IMO.

id say contrasting colours the best

[Karbea]

Yes I does have to be in front of the window, it is already, but we've curtains and they're a real faff to pull, so I'm thinking a blind will be easier.