Hi and welcome,
If you are having a lot of hypos, then yes, it sounds to me like your insulin dose needs adjusting downwards. You shouldn't be having to suffer this and it must be very scary for you. However, I don't and never have taken insulin, so I am no expert and not a doctor.
What sort of levels are you seeing before bed (before you take the Lantus) and how low are you dropping, and how many units of Lantus do you take.
First I am type 2 not type 1, I think there was a typo.
My levels after dinner usually run between 150 and 179. I take 28 no of Lantus at bedtime and in the middle of the night / early morning has gone as low as 59- 70. The other night it had gone to 63, I awoke, sweating, shaking and felt like I needed to vomit. I took a couple glucose tablets which helped get it up again. I had told my Dr about this and the 28ml twice a day of Lantus is actually less then what I was taking before. She previously had me on 32 no.