Ok so this has been happening lately

Im laying in my bed
then suddenly I feel this pulses, like electricity
This are a bit painfull, well not painfull but not pleasant
They occur in intervals

I feel this thing
then it fade away
then again I feel it
and it fade again

this happen for a couple of minutes
until I loose consciousness
or until I woke up

And I don´t know if this is normal
or if its only a dream about this feeling