[Nfxutkpa]

I reached this aspect of the sutta:

"Wakefulness "And what more is to be done? 'We will be devoted to wakefulness. During the day, sitting & pacing back & forth, we will cleanse the mind of any qualities that would hold it in check. During the first watch of the night,[2] sitting & pacing back & forth, we will cleanse the mind of any qualities that would hold it in check. During the second watch of the night[3] reclining on his right side, we will take up the lion's posture, one foot placed on top of the other, mindful, alert, with the mind set on getting up [either as soon as we awaken or at a particular time]. During the last watch of the night,[4] sitting & pacing back & forth, we will cleanse the mind of any qualities that would hold it in check': That's how you should train yourselves."

Can somebody clarify what is meant by this? The numbered quotations given for the sutta gives a kind of horary. The quotation numered as [3] span from 10 pm to 2 am: is this a time to sleep or to still be awaken? And then number [4] span from 2 am to dawn: Is this a time for meditation?

Help is needed...