Of Withering Dreams (Fate of the Embered #1) by Rowyn Adelaide:
 
DREAMS DECAY.

The Dormancy was meant to be the mortal realm’s salvation. From autumn to spring, citizens must enter a magically induced slumber to conserve dwindling resources. The divine Ancients, who gifted mortals magic, disappeared long ago, leaving humanity at the mercy of the Elders. These powerful and elusive oligarchs have one motto: "Through Dormancy, we blossom!" Yet, this seems more like a cruel jest than a promise.

For Seryn, this Dormancy will change everything. Except for the little details… you know, like her realm progressively decaying and people vanishing. As the threads of reality unravel, she soon discovers her hidden identity as a Druik, one who wields magic. But her abilities are… unusual. Unpredictable.

DESIRES BLOOM.

While her inherited powers bloom, so do her desires for her charming best friend, Kaden. She wouldn’t dream of risking their friendship, but the Fates can’t be bothered with mortal dreams.

DESTINY UNRAVELS.

Navigating a treacherous path where dreams and nightmares blur, Seryn must confront haunting truths. Her newfound courage and magic might be the key to saving her realm, but will they be enough when even dreams can wither into oblivion?