Overnight, which is eight hours and mostly sleep
An overnight is a block of eight hours, priced whole instead of hour by hour, and the greater part of it is spent asleep rather than awake.
Eight hours, agreed as one block, carry one set figure when a single guest keeps a single therapist through the night, and it comes in under what eight hours bought singly would total. Two guests sharing her double that figure. Two therapists with one guest are reckoned another way, as eight hours on the doubled hourly line, and two guests with a therapist each double that line once more. Half of whichever line applies goes ahead in every case, since a night always carries a deposit.
What the hours actually hold
Not eight hours of massage, which nobody wants and nobody could take. A night is usually a long slow session, a gap, sleep, and something quieter in the morning. The proportions are settled between the two of you on the night rather than planned in advance, and most of the block is ordinary sleeping.
Why it suits this particular guest
The thing that tires a quiet guest is transitions: arriving, being met, being seen, leaving, being seen again. A night has two of those instead of the several an evening out would involve. There is no point in the small hours where anyone has to decide whether to call a taxi. For a guest who has spent three days in crowds, the absence of a departure is often worth more than the additional hours.
Arranging one
Name the start time and the address in the thread, and give the entrance details properly, because a street door that locks at midnight matters more on a night booking than on any other. A quiet night is worth asking for explicitly, in the same line as the rest of the quiet request. The overnight page sets out the shape in full.