Freddd, Thanks for the reply. I have decided to hold off on the adb12 for a week. Will just take the mb12 and move up/down as required.That will help to find out the cause of insomnia. I will keep TMG in mind. I would like to state again that I experienced the nerve sensations with the NOW mb12 sublingual and not with the Jarrow sublingual. If this neurological effect is what is needed, doesn't this mean that I respond better to NOW than Jarrow? I totally understand the sleep problem. I also experience varied energy levels(ranging from happy and focussed to confused to completely exhausted within minutes of each other!)throughout the day, and it's like I cannot commit to anything in the very near future, because.It's like there's no rhythm in life at all and it feels like madness many times.It feels like decades since I felt calm and relaxed. Any suggestions on how to feel at ease? ( It seems to me that the internal mechanism that provides relaxation and such things is flawed or inaccessible and hence, there is no way out!) Thanks.