My issue is not with your way of input, but with the question itself. My sleep patterns shift forward every single day.
I no more have a time I go to bed every night than I have a US zip code or a ten-digit cell phone number.
I no more have a time I go to bed every night than I have a US zip code or a ten-digit cell phone number.
We've taken what are the clinical standard measures - and some indeed feature counterintuitive questions. And you're right, one of the main issues with 'insomnia' is an unreliable sleep pattern.
We don't want to know how you slept last night, since this may be unrepresentative; but as you say an 'average' may also not capture it/be a natural way to report it. 3 x sample points ('last 3 nights') may be longwinded. Will consider...any ideas on a better question?