The thing is: the side effects of such efforts are unknown. From one of the mailing lists that talks about tDCS, here's a snippet of a recent email that caused

The thing is: the side effects of such efforts are unknown. From one of the mailing lists that talks about tDCS, here's a snippet of a recent email that caused me to take pause: ----- I have never been able to directly correlate anything i've done, or taken, to the severe decline in my sleep quality (both falling, staying asleep). Being diagnosted with sleep apnea has helped, as the machine has been a bit of a help, but not as much as I would have hoped. I'm wondering if any of the tDCS I had done on myself (and i did do a pretty significant amount I guess about 12-18 months ago) might have caused persistent sleep disturbance? ----- If indeed this person is correct, then it is possible that long term heavy use of tDCS can cause sleep issues. I'd much rather sleep well than play the piano. :-)