Function keeps_close_of 

fn keeps_close_of(
    entries: &[Entry],
    own: &str,
    now: i64,
    asleep: bool,
    dose_open: impl FnOnce() -> bool,
) -> bool

keeps_close, from what was read: the devices’ entries, this phone’s id, now, you asleep, and whether a dose is due and not marked (asked only when it decides).