Beech 1900 pilot reported falling asleep for 30 minutes in flight.

Attributes
ACN	1538225
Time
Date	201804
Local Time Of Day	0001-0600
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Make Model Name	Beech 1900
Operating Under FAR Part	Part 135
Flight Phase	Cruise
Flight Plan	IFR
Person 1
Function	Single Pilot Captain
Qualification	Flight Crew Instrument Flight Crew Multiengine Flight Crew Commercial
Events
Anomaly	Deviation - Procedural Published Material / Policy Flight Deck / Cabin / Aircraft Event Other / Unknown

Narrative:

Flight was fairly routine. After departure I was issued a vector directly to ZZZ after leveling off and completing cruise checklist and completing trends; it appears that I fell asleep for approximately 30 minutes. I became aware [I had fell asleep] and was highly disoriented. It took me a minute to analyze my position and contact the appropriate ATC frequency. Landed at destination without further event. Leading up to the event the day prior was plagued with sleep interruptions. I had been drinking a mug of hot tea prior to the flight all winter and decided not to today. I don't know what will stop life from getting in the way of work. Don't stop caffeine cold turkey.

Original NASA ASRS Text

Title: Beech 1900 pilot reported falling asleep for 30 minutes in flight.

Narrative: Flight was fairly routine. After departure I was issued a vector directly to ZZZ after leveling off and completing cruise checklist and completing trends; it appears that I fell asleep for approximately 30 minutes. I became aware [I had fell asleep] and was highly disoriented. It took me a minute to analyze my position and contact the appropriate ATC frequency. Landed at destination without further event. Leading up to the event the day prior was plagued with sleep interruptions. I had been drinking a mug of hot tea prior to the flight all winter and decided not to today. I don't know what will stop life from getting in the way of work. Don't stop caffeine cold turkey.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.