Agreed with Sue, the same goes for people who are running too high, they become symptomatic of hypos at 5 or 6 because they aren't used to being 'so low'.
Gradual reduction and then keeping steady is the way forward. In addition you need to listen to your body, many of us have one or two common symptoms, some all, but then there are various symptoms which may be a quirk of us. As my levels run low I foolishly as a reaction speed up! Speech, movement the lot. Until I STOP!
I am on NovaRapid and can still determine the effect of a pending hypo, it's really a case of spotting the symptoms as soon as they appear, stopping what you're doing and attending to your levels - hopefully you will soon realise that ignoring them and pushing on through doesn't work, never does with a hypo and its always quicker to stop, get some glucose in your system and get a sandwich down your neck, take a few minutes, check your levels, adjust insulin etc and then carry on.
If you don't stop when the symptoms are first recognised you will fatigue yourself further, it may take longer to sort yourself out and potentially waste the rest of the day as you'll be wiped out from the hypo. Not to mention potentially scaring the livign daylight out of those around you.
Just my experiences, others I am sure will tell you different experiences.