It depends upon what you trade when really, the asian session is no less choppy than every other, the range nevertheless is smaller on many european pairs such as euro, swissy and cable. If you would like to trade the asian session, examine the oceanic and asian area pairs, such as Yen pairs, NZD and AUD crosses, you will find a much better range there. A lot of FX brokers are now offering index's too, so that is just another option to trade during those times.
In terms of more hazardous? . . I believe so at all, if anything, with all the smaller ranges, it's safer for the newer trader.