It's funny, isn't it - all the week you work away at a boring job, looking forward to 5pm on Friday, and when you get there you're looking forward to 8.30am on Monday!
For me, Fridays were boring when I was single and lived on my own. I tried to build a routine around having a couple of bottles of beer at home and watching a DVD, but it got dull quickly. Fridays were always boring because you foiund yourself wondering what to do with the boring Saturday and even more boring Sunday to come. I would tell myself I could go for a nice walk, anywhere, but that neon sign attached to my head, the one visible only to abusive teenagers, stopped me.
They're boring now, even though I'm happily married and living with my wife. She gets home Friday evening and just vegges out, which I totally understand, but I find myself just pacing about, not knowing what to do with myself and I usually end up in bed by 9.30. Occasionally we do go out, but I just end up sitting quietly while my wife cheerfully chats with her friends/colleagues.
I know what the OP is on about, and if I knew how to make life better and more fulfilling, the OP would be the first to hear about it!