It sounds like a loose connection. If it is all lights then look in main panel. If just some lights look at the switch first for loose connections. There is a good chance that the neutral from the service entrance cable to the panel is loose. BE VERY CAREFUL WHEN WORKING IN THE PANEL. Even when the main breaker is off, there is still some power in the panel. If in doubt, hire a licensed electrician.
Don't know if you noticed, but you just asked the reason for a person blacking out for no apparent reason, lol I'd consult a doctor.
The most common reason is stress and anxiety but of course streneous exercise can contribute..if it happens for no apparent reason its smart to have it checked out
Caesar had epilepsy. It causes a small seizures for almost no apparent reason. in the play it is referred to as the falling sickness
I should mention that the alternator has gone bad and been replaced, so has the battery. The various dash lights will often come on and go off for no apparent reason also.
Heres an example: What is the question that contains the word cantaloupe for no apparent reason?
they kill people for no apparent reason
to pleasure vagina
Trident was used for no apparent reason
your alternator was never the problem. Its your battery and/or charging system. the reason the lights get brighter is because the car isn't getting the propper amount of energy from the battery and is having to directly draw off of the alternator. when the engine is rev'ed the alternator spins faster creating more current to charge the battery, witch is why the lights brighten at higher rpms.
Extreme happiness and excitement for no apparent reason.
Being overly friendly with someone for no apparent reason.