It's when you have a late night conversation (usually while on the phone), while very sleepy. The next morning, you forget what you were talking about towards the end of the conversation.
Guy 2: Uhh... No, I think I have sleepnesia...
Vul hier je e-mailadres in en ontvang elke ochtend gratis het Urban Word of the Day!
Je zal emails ontvangen van email@example.com. We zullen je niet spammen.