The gaps open and will often be filled

The price gap can be an over-reaction of the market to the news at the end of the week or a move against the long-term technical trend.

After the Australian session opened for about 3-4 hours, the Asian session started to work, causing the volume and liquidity to increase. An unusual Sunday gap will tend to return closer to the Asian opening. As shown below:

Most price gaps tend to do the same. Markets need to return to the average or close at the end of last week. Only then can the markets choose a new direction for the currency pairs, with higher liquidity, more volume, and more news to move about.

And what if the price gap doesn't narrow quickly?

A gap that extends through the opening of the Asian session is usually a price gap that makes more sense for traders. It implies that the information over the weekend is very important. If the price gap follows a trend, it could be more valuable information in the future.

A price gap that does not go back to the opening of the Asian session, but it does extend to the European session, this gap is even more significant. Volume was high during the European session, especially on Monday. If the price gap has not yet been filled, it is highly likely that the currency pair will continue to move in the direction of the gap.