Dickson G. Watts, who was head of the New York Cotton Exchange from 1878 to 1880, wrote an article (later reprinted as a short book) on “Speculation as a Fine Art” for The Cosmopolitan magazine. In it, he wrote: ...when doubtful, reduce the amount of the interest; for either the mind is not satisfied with the position taken, or the interest is too large for safety. One man told another that he could not sleep on account of his position in the market; his friend judiciously and laconically replied: “sell down to a sleeping point.” This lesson was recounted in Reminiscences of a Stock Operator. And so, it seems you have the opposite problem. Perhaps you should increase your size to the waking point.
Yes, sometimes when market become less liquid and you want to enter the market as soon as possible, then you will encounter the sleep as I also do so. By the way, you need to stay awake as opportunity is always on the doorstep while trading.