If you're stuck in Heathrow between flights for 9 ...

If you're stuck in Heathrow between flights for 9 hours during the day and want to catch up on some sleep rather than venturing downtown, a day room at the LHR T5 Sofitel is a good choice. You need to contact the hotel directly to book, as day rooms are not available on the website or through 3rd party booking sites.
Rates are reasonable, and the room service food quality was very good.