Phrases Talking About Stress or Anxiety

I'm losing sleep.

Meaning

I'm not sleeping well because of stress or worry.

John: I'm so stressed about work lately. <b>I'm losing sleep</b>.
Alice: Oh no, I'm sorry to hear that. What's causing you so much stress?
John: This new project is incredibly demanding. Honestly, <b>I'm losing sleep</b> over it.
Alice: Maybe try some relaxation techniques before bed?