"would'' and ''used to' expresses the idea that something was an old habit which stopped in the past. It says that an action was often repeated in the past, but it is not usually done now.
What I have understood is:
When I was a child I always used to/would watch tv all night, but nowadays I have started watching tv all night again.
I used to play computer games every day when I was a child. (I don't play any more)
I would play computer games when I was a child. (May be I play or not, is that ok?)
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