No need to delay procedure based on fasting time. Preprocedural fasting for any duration has not demonstrated a reduction in the risk of emesis or aspiration when administering<unk> and analgesia (ACEP Level B) 
Some specialty societies recommend:
2-hour fasting time for clear liquids
4-hour fasting time for breast milk
6-hour fasting time for solids
2-hour fasting time for clear liquids
4-hour fasting time for breast milk
6-hour fasting time for solids
Procedural sedation 
ICU sedation
Body packing
Trauma sedation
Vascular access
Intranasal sedation
Advanced airway adjuncts
Anticonvulsant levels and reloading