OP, One more thing to consider. Do you want to avoid sideways or enter at sideways? When price goes up and down down and up do you know who is in control and for how much longer? I don't. Inside bars are the only point I have found that you can start from scratch. IOW you can define a specific point where buyers/sellers gain control and trade away from this starting point. DBphoenix refers to it as the hinge. FS
The days of being a breakout trader, I remember those. LOL. Until I came to the realization that breakouts are rare and that buying support and resistance is where the money is at. Sideways markets can be profitable if the range is wide enough to buy low and sell high...granted that you've determined zones of support and resistance.
While trading, I spend most of my time watching youtube video or play computer game or do other stuff. So I can't actually tell it's going sideways. Since I have trades on 24/7/365, I can only presume it goes sideways on weekends and holidays. If the market doesn't move, it can't kill me.