Crossword Genius

Words get muddled at day's end when tired (6)

Ross

I believe the answer is:

drowsy

I'm a little stuck... Click here to teach me more about this clue!

'tired' is the definition.
(I've seen this before)

'words get muddled at day's end' is the wordplay.
I cannot quite see how this works, but
an anagram of 'words' is 'drows' which is present in the answer.
A single letter 'y' remains which might be clued in a way I don't see.
This explanation may well be incorrect...

'when' is the link.

Can you help me to learn more?

(Other definitions for drowsy that I've seen before include "Almost asleep" , "Comatose" , "Wanting to nod off" , "liable to drop off" , "Sleepy, somnolent" .)

I've seen this clue in The Globe and Mail.
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