“I only put four or five drops into her tea,” the man told the court in Castrop-Rauxel as he admitted to the crime, the Westdeutsche Allgemeine Zeitung reported.
On an evening in August 2014, he was playing on his games console with a friend when his (now ex-) girlfriend arrived at home at around 10pm.
After ten hours at work, she had understandably been planning on having a quiet evening rather than one punctuated by the clatter of machine-gun fire or computerized commentators screaming over a non-existent football game.
The woman slept until midday the following day after drinking the drugged tea.
“Then I got up and drove to work although I was nodding off again and again,” the 24-year-old told the judge.
Her then-boyfriend admitted what he had done on the day after the crime.
She added that her ex, too, had been on drugs at the time, which was the reason for their breakup shortly afterwards.
An analysis of the girlfriend's hair showed that she had been under the influence of those drugs just once, at the time when her ex slipped them into her drink.
“Your girlfriend slept long and deeply, which didn't harm her, but this is certainly a premeditated bodily harm,” the judge said as he sentenced the man to pay a €500 fine.
“It was stupid, but now I'm on a straight path,” the ex-boyfriend said, adding that he had been off drugs for 10 months and would soon begin an apprenticeship.