Does the old freanch verb that gave rise to reverie mean to be happy or dream

It means to dream/to be in a dreamy state.

daylight saving time (dst) has been used for more than 100 years. changing the clocks does not create extra daylight, but it causes the sun to rise and set at a one of the aims of dst is to make sure that people's active hours coincide with a german analysis of 44 studies on energy use and dst found a positive