Instead of counting sheep to fall asleep, plant enthusiasts should count tulip cultivars. There are upwards of 2400 cultivars listed in the RHS Horticultural Database. It is doubtless that there are many more, including some that have been lost to cultivation.
Among those 2400+ cultivars, Tulipa ‘Sorbet’ is designated as one that has received an Award of Garden Merit from the Royal Horticultural Society. The Wikipedia entry on tulips is lengthy, if you’d like additional reading since I’m away this week.