Soma in the Night
During the day, Soma is an art exhibit for the general public to witness and spectate. However, in the night, Soma is a night experience for people to stay and sleep with the animals still present. Once you first stay in Soma, you'll noticed that in the exhibit the animals are always making noises. You might think this could be annoying slumber, but once tucked to bed the noice becomes soothing and bearable to sleep through. You can hear the crackling of the raindeers' antlers, the chirping and wing flaps of the canaries, while you are sleeping peacefully. Without the noise of museum goers, this makes the noice of the animals uninterrupted and become its own exclusive event to sleep through. One you're woken up you'll notice the reindeers have presumably moved side during the night. It's up to you to interpret this as an affect of the mushroom.