zex-sleep is a product manufactured with modern French technology that acts as a fast anesthesia. The sleep time ranges from 1 to over 3 hours and typically takes effect within 5 to 20 seconds. How to use: You can mix it into water or food, with 1 to 2 drops each time. Speaking of pheroken, you will certainly know a little about this product because on the anesthetic market today, this is the leading product being used the most today.