Hi Sura. No problem, we could change you onto a standard, or 'single rate' tariff. We'd just need to look at what you actually use, and then work out whether it would be cheaper for you to switch to it.
If you're using most of your electricity between 8am and midnight, then you'll find you're probably not fully benefiting from the cheaper night rate.
Please call us on 0845 071 4525 so we can go through your energy use for you. We can then arrange the change if you decide to go for a single rate tariff instead.