This article about current use of wearable tech to try to better understand how student physiology and mental states affect their learning is a little scary, but pretty interesting.   I’d get an Empatica wristband

Empatica's "Embrace" Watch doesn't just monitor activity and sleep, but also physiological stress and arousal

Empatica’s “Embrace” Watch doesn’t just monitor activity and sleep, but also physiological stress and arousal

to help me understand just how I feel about the whole idea, but they retail for $1700…!