He estimated how many species of insects lived on each plant species in England, and then extrapolated that figure across the whole planet. âIf we say 400,000, we shall, perhaps, not be very wide of the truth,â he wrote. Today, scientists know the Westwood figure is far too low.
Symptoms: A chronic dry cough that's worse at night, disturbing sleep, and sometimes with wheezing and shortness of breath. Causes: An irritating night cough is often the first sign of asthma, especially in children, but you can develop it at any age. It's also a sign asthma is worsening or not being well controlled.
Postnasal drip. Sounds like: Either a dry or wet cough. Itâs caused by mucus dripping down your throat (due to either allergies or a cold), which tickles nerve endings, triggering coughing, Dr. Parsons says. Other telltale symptoms: The cough is worse at night; thereâs a tickly feeling at the back of your throat.If itâs due to allergies you may also have itchy eyes and sneezing. Diagnosis and Rx: If you suspect allergies, try an over-the-counter antihistamine.ounds like: Either a dry or wet cough. Itâs caused by mucus dripping down your throat (due to either allergies or a cold), which tickles nerve endings, triggering coughing, Dr. Parsons says. Other telltale symptoms: The cough is worse at night; thereâs a tickly feeling at the back of your throat.