That seems a bit warm for me, I'm wondering whether the study was done using people in a hot region and therefore acclimatised to higher temperatures. I haven't found the full text of the article to confirm my guess but it does seem likely since it's talking about finding decreases in sleep quality when bedroom temperatures rise from 25° to 30°.
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I am not at peace when I am asleep unless I am in a room that is as cold as an ice maker
My setback thermostat goes to 16C (61C) at 11:00pm. Winter is when I sleep the best.
In the summer, I just go to 21 with the AC.
Good thing I only sleep in Celsius