I have mild breathing issues during winters, which affects my sleep and I used to wake up with a headache. The fingertip SpO2 meter helps quantify the problem,

I have mild breathing issues during winters, which affects my sleep and I used to wake up with a headache. The fingertip SpO2 meter helps quantify the problem, so it was a good buy. According to my readings, headaches were bad when my readings were 92 or lower. Also helped when my son was having bouts of bronchiolitis when he was younger. It's only about $50 and batteries last long, so I'd totally recommend it if you have breathing ailments. Maybe even otherwise.