The passion of accidie (sloth) is the desire for the pleasure of doing nothing.
Accidie is a spiritual passion, and although it can present itself as a desire to sit around doing nothing at all, it is primarily a passion for doing nothing spiritually. The passion of sloth reminds you, just as soon as you've started to pray, that you have a whole pile of things that have to be done right now, that just can't wait.
Hesychasts have a lifelong battle with accidie. Monks living in coenobitical monasteries have much less of a problem.
Lay people are affected by sloth in various ways: by being lazy in the obvious sense, but also by not having enough time for prayer or by being too tired to read the Bible, a spiritual book and so on.