Interesting, blue lotus is apparently sedative... Theres almost nothing on pharmacological studies online that I can find or access on the actions of Blue lotus. The only thing I found about this that looked promising was this.
This website mentions that it contains apomorphine, http://en.wikipedia.org/wiki/Apomorphine
also nupharin, nymphalin, ellagic acid (Roth et al., 1994) ".
I found no info on nupharin, not much on nyphalin, but it seems that the genus Nymphaea contains different ratios of the similar chemistry according to a quick brous on Nyphaea genus.
I have never tried Blue lotus but I am curious in the effect it has on you.
I noticed that the Encyclopedia of Psychoactive Plants has this plant and says this about it:
"No pharmeceutical properties of Nymphea lotus and Nyphea coreulea are known. Yet the leaves and flowers are alleged to have narcotic properties. According to Emboden (1978), Nyphaea caerulea presumably contains alkaloids. The flowers produce an exquisite essential oil that is said to have aphrodisiac properties."
and on the Effects:
"Three to six buds, drunk as a tea, are said to induce hypnotic effects. The effects of the decoction become apparent some twenty minutes after ingestion. The initial symptoms include muscle tremors and nausea. Then comes a sensation of calm with alterations of color perception, auditory hallucinations, and other changes in auditory perception. The effects dissipate quickly after two hours."
Does this soud similar to what you have experienced?