Different species require different rest periods, and it can vary widely with where they are grown while in cultivation.
In general, a rest period is a period of time, usually from one to two months in length, where the plant receives both a drop in night temps in the winter, of about 20°, from summer nighttime lows, and an almost complete withholding of water.
Both parvi and brachy groups have plants with thickened leaves and thick roots that are able to store large quantities of moisture, and they go through this rest unaffected. Humidity levels above 50% are helpful at this time, but not exactly necessary in all cases.
If your growing area has extremely low humidity, and nighttime temps remain above 50°, with daytime temps in the 80s, and you have a strong, drying fan blowing on your plants, then perhaps you would need to add supplemental irrigation. But, then this is not quite the temp drop required for most paphs. Rather than daily misting, I would recommend in-pot water at bi-weekly intervals.
Do not be afraid to withhold irrigation for weeks at a time, in many situations. And get the nighttime temps into the high 40s or low 50s depending on summer lows. A rest means "REST."
Species that come from lowland areas near the Equator have different resting requirements (which can become different when under cultivation), and their rest period might only last for 3-4 weeks.
There are two reason plants fail to bloom: they either do not get enough light, or, they do not have a sufficient rest period.