From Longman Dictionary of Contemporary Englishlast thinglast thingEND British English at the end of a day, afternoon, evening etc She likes a hot bath last thing at night. → thing
Examples from the Corpus
last thing at night• Why not set a few moments aside first thing in the morning and last thing at night?• The only times my father could be found in his room were first thing in the morning and last thing at night.• Empty ashtrays last thing at night, and don't smoke in bed.• This can be carried out last thing at night, once the puppy has been outside to relieve itself.• The rosary last thing at night.• Of course, only in moderate quantities, and generally to be taken last thing at night.• It was after dark; the last thing at night.• It's the first thing I look at when I wake up, the last thing at night. 