As an added incentive, there is usually an Uxbridge Road race at the end, provided something happens to kick it off...usually a RLJing local.
You may want a hot drink, in which case buy a £3 s/s thermos flask from Wilko and put it in a sock, then into the bottle cage (the sock stops it rattling and probably adds a bit of insulation). If you take milk, make it with warm milk and pre-heat the flask. If made at 9pm, it will still be too hot for swigging at 3.30am.