Allow target to be a time

[pachacamac]

E.g. to track bed time habits

[neube3]

I realise this isn't perfect but you could use military time or an equivalent. E.g. daily + at most + 2400 and then note the hour there in HHmm format.

I, myself, have a bunch of yes/no habits for tracking bedtime - e.g. "in bed before 2200", "in bed before 2230"... and tick them to be able to have more meaningful statistics.