pernoctation

from The Century Dictionary.

• noun A passing the night in sleeplessness or in watching or prayer; a vigil lasting all night; specifically, in the early Christian ch., a religious vigil held through the entire night immediately previous to a given festival.
• noun A staying out all night.

from the GNU version of the Collaborative International Dictionary of English.

• noun The act or state of passing the whole night; a remaining all night.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun An overnight stay; action (or instance) of abiding through the night at a location.
• noun The action (or an instance) of walking about at night, especially as a vigil or watch.
• noun Christianity A religious watch kept during normal sleeping hours, during which prayers or other ceremonies are performed.