17:27
MAYBE
Checking your clock…
In Cleveland the local lexicon for a late ping is not 'async' — it is a flare. Hospital systems never sleep; corporate Slack does, around 17:30. The polite window around Downtown Cleveland is 08:00–17:00 local. Midwinter sunsets still arrive before dinner, which makes late Slack feel later than the clock. Ping their late morning unless you already share an on-call rota. Cleveland still shifts with daylight saving (UTC−5 in January, UTC−4 in July).
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Cleveland is 17:27. Verdict: MAYBE. Check before you ping → https://asleep.today/cleveland