Narrative:

I landed north runway 31C, tower instructed me to turn left at taxiway a and taxi via taxiway F. I turned left at taxiway a and saw taxiway F then turned left onto runway 31L and proceeded to roll southeast on that runway. Just before runway 4L, tower told me I was on runway 31L and to turn right onto runway 4L and continue on taxiway F. Runway 31L was not in use at the moment so lucky for me. I just began this route and this was my second time into mdw since beginning and my third time ever to the airport. Normally, I'm sleeping from XA30 to XE45. Because I was so tired and sleepy I just wasn't thinking quick enough. As hard as I try, I am not as sharp when flying hours that I'm normally sleeping. I could have flown my old route this tired, and probably nothing would have happened. Not the case with unfamiliar airport.

Google
 

Original NASA ASRS Text

Title: BE58 PLT HAD RWY INCURSION AT MDW.

Narrative: I LANDED N RWY 31C, TWR INSTRUCTED ME TO TURN L AT TXWY A AND TAXI VIA TXWY F. I TURNED L AT TXWY A AND SAW TXWY F THEN TURNED L ONTO RWY 31L AND PROCEEDED TO ROLL SE ON THAT RWY. JUST BEFORE RWY 4L, TWR TOLD ME I WAS ON RWY 31L AND TO TURN R ONTO RWY 4L AND CONTINUE ON TXWY F. RWY 31L WAS NOT IN USE AT THE MOMENT SO LUCKY FOR ME. I JUST BEGAN THIS RTE AND THIS WAS MY SECOND TIME INTO MDW SINCE BEGINNING AND MY THIRD TIME EVER TO THE ARPT. NORMALLY, I'M SLEEPING FROM XA30 TO XE45. BECAUSE I WAS SO TIRED AND SLEEPY I JUST WASN'T THINKING QUICK ENOUGH. AS HARD AS I TRY, I AM NOT AS SHARP WHEN FLYING HRS THAT I'M NORMALLY SLEEPING. I COULD HAVE FLOWN MY OLD RTE THIS TIRED, AND PROBABLY NOTHING WOULD HAVE HAPPENED. NOT THE CASE WITH UNFAMILIAR ARPT.

Data retrieved from NASA's ASRS site as of July 2007 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.