D'you mean the Sleep Cream? I didn't buy the Advent Calender but I think there was a sample in it.
I bought a Face Kit (4 items+ a brush) in the recent sale, the Sleep Cream was one of them. (Was £70 reduced to £35 so average £7 per item)
Really nice (not sure if its £22 nice) not giving me the 8 Hour sleep look (yet) but I cannot remember the last time I had 8 hours unbroken sleep anyway .