Visitors (including non-Buddhists) are allowed to stay overnight in neat twin rooms attached to Quanhua Temple. The old rules forbidding talking during meals or couples sleeping together are no longer enforced, but do be on your best behaviour. The staff at Lion's Head Mountain Visitor Centre can help you book.
Excellent vegetarian meals are included in the rate; if they don't appeal to you, check out the stalls and shops lining the back car park or the cafe on the way up to the hall. The office where you check in if you are spending the night is beside Futian Temple.