I find the practice gives a lot of leeway with little adjustments along the way. Keeping well hydrated before sleep (especially if having done any physical exercise that day) and only light snacks later in evening make it not bad at all. It is strangely tempting at times to do more, maybe because of the bit of a boost it gives off, and if it isn't clear enough, holding the breath really takes away any unpleasantness (though that is said to diminish some of its benefits). Another effect I'm monitoring is its ability to take away or delay hunger in the morning, so it can be straight into sitting practice right after waking. It's been ongoing here for many months now at least, though I do pause for a week now and then if I have a cold, or my morning practice is offset for a day or so, though the benefits are always there and always look forward to it.
