A 29-year-old former engineering student posted his shirt idea on Imgur, a popular image sharing site, for other students who sleep on the subway on the way to class.
The shirt reads: "Wake me up at St. George Station" on the back. The message becomes visible when a passenger leans forward to rest his or her head on a backpack or folded arms.
The image on the shirt features the outline of a hand under the message where other passengers can pat the student to wake him or her up at St. George, the main transit hub for U of T's downtown campus.
"I got the idea while studying engineering at U of T," wrote the student. "Normally I slept slumped over on my backpack."
The accompanying photo shows a man sleeping on the subway with the shirt on. There's no indication whether the T-shirt worked or not.