I suspect that you've probably already arranged your flights but, if not, have you thought about seeing Boston on the way home? I often stay a night on my way back from the US because both BA and American operate day flights to Heathrow from there. The BA flight gets into Heathrow around 7.30 pm (and is often early) so, depending where in the UK you live, you can be home and in bed at a reasonable time and avoid the night flight and most of the subsequent jet lag.
There's a decent Hilton within Logan airport and it's only a couple of stops on the 'T' to be downtown.
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