eevees (on any Pokemon game) evolve into umbreon or espeon with happiness. happiness at night will result in an umbreon just as happiness in the day will be an espeon. to increase happiness, walk around with your Pokemon A LOT. i think its like 256 is 1 point. they evolve at about 250.
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Eevee doesn't have a set level to evolve into Umbreon. All you have to do to evolve it is max out its happiness at night. ~KKMG1
To make Eevee evolve into an Umbreon, you have to level it up with high happiness at night.
Make Eevee as happy as you can. For Umbreon, level it up at night. For Espeon, level Eevee up in the day.
You will need to have your Eevee to full Happiness, then level it up at least once during the night to evolve it into Umbreon.
you have to level him up at night