We have the screaming from about 5 or 6pm - about 9 or 10pm (only rarely later than that). We basically have to play MAJOR distraction. She's not hungry because she'll refuse boob, we just think she's bored. So, reading books to her, joggling her up and down, walking up and down the stairs with her over your shoulder, her in the bouncy chair on the kitchen units watching us wash up (this lasts about 3 - 4 minutes before she starts again), constant changing of position if she's on our laps, standing up on our laps, pushing herself around on the play mat (again, 3 - 4 minutes max), dancing with us to music, having a bath, having her nappy changed (she loves this for some reason, but there is only so long you can leave her on a changing mat), having the hairdryer moved over her, sitting on a beanbag while we hoover.
Basically if you're not expending calories in the name of her comfort, she's bored/uninterested in just sitting around or sleeping. The screaming time period has lessened over the last week or so, but that's just because we've worked out how to deal with her. We don't get to eat at the same time!!
Conversely she's slowly getting in to a pattern of waking up at around 7am, being fed and played with for an hour or so, then sleeping again until 10 - after that she's WIDE AWAKE for 4+ hours - but not unhappy, usually quite smiley and sunny - that's the most fun time with her. After that she'll usually sleep on me, or in a sling (so, on me), roughly until it's time for screaming!
I bought a 3.5 tog sleeping bag - the recommendation for clothes under it is nowhere near what I've been putting her down in. Poor thing has probably been freezing since the weather turned. Crap mum alert.