Not an entitlement, but worth asking - and a nice gesture if the property does it. Those saying that it's 'strictly for the following day' - I don't know, we've all departed at 5am before and missed the 'entitled' breakfast on said day, plus I often stay solo and only use one of two breakfast entitlements, etc. It likely all evens out in the end, and we should all just take a nice deep breath (and focus on the St Regis Aspen

).
Never hurts to ask, and it's a nice impression if met.