"I sleep less than you."

Translation: मैं तुझसे कम सोता हूँ।

[Anand309040]

'Aapse' worked me. You had entered 'tumse'. Probably a mistake from their side because both are correct for 'you'.

[Sam362597]

Hey, this one just failed me for missing out the full stop! That's harsh, Duolingo....

You missed a word.
मैं तुमसे कम सोती हूँ। (only । was underlined....)