Well yes, but it has to be going on for some time, and sometimes it’s a sign of an underline health issue that’s the real threat. Of course, lack of sleep can cause dangers because you may get drowsy when driving or working with something dangerous that requires focus. But when you usually can sleep try to stay up as long as you can to work your way back to a nighttime pattern. No electronics at night. Maybe a nice bath in Epsom salt before bedtime. If you are menopausal this is normal. If its work-related stress then that can happen as well. But I would see a doctor if this continues on. Certain ailments or conditions can be a problem. Maybe during the day set an alarm for one hour during the time you usually sleep so you won’t feel too rested and can hang on till late. Don’t do anything stimulating before bedtime or eat heavy. Make your room a nice cool dark cave. And maybe try some Melatonin and don’t get stressed out about how much sleep you get. Its more important to get quality sleep at night. These are all things I have done to help with sleep when I was having problems with my sleep pattern as well. I found that Melatonin didn’t work for me but I know some people who sleep well using it. It’s over the counter and won’t leave you groggy when you wake up. Mine was caused by menopause and the lack of sleep made me stressed which only made things worse. So try not to stress. But get a physical to make sure its nothing else. I went from 4 hours of sleep to sleeping 6 hours for many months to finally being able to sleep 7 to 8 hours straight. I still go to bed late but I try to make sure I’m in bed no later than 3 am. and sleep no later than 1030 or 11. When I’m busy all day, I can actually be in bed by 11pm and up by 8.