Why it seems that bitcoin is most active at night in the US eastern time?

I wake up at 4:30am to an alarm from my phone telling me btc dropped from 1120 to 1050 in a matter of minutes. Then i stay awake for about an hour buying and selling during the "volatility" and place a buy order when i see that the price seems stable at 1100 and go back to sleep. Then i freaking wake up again 3 hours later after  hearing my phone vibrate like crazy to find the price dump to 920!!  What do i do now? Hold? Or Sell?

For those in east coast, how do you deal with this volatility during the early hours of the morning???