Sleepiness

The smartwatch has a sleepiness mode to conserve power when not in use.

My car stereo goes into sleepiness mode after a few minutes of inactivity.

The medication caused a sense of sleepiness in the patient.

The long drive made him feel a sense of sleepiness.

She couldn't shake off her sleepiness even after drinking coffee.

After eating a heavy meal, he felt a sense of sleepiness.

The boring lecture put the students in a state of sleepiness.