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.
Other causes of sleep disturbance include sleep apnea, teeth grinding, allergies and colds, snoring, frequent urination, fibromyalgia, and nightmares. Sleep apnea causes breathing interruptions during your sleep, and teeth grinding (which is called bruxism) can cause you to wake up during the night.Allergies, colds, coughing, and upper respiratory infections can make it difficult for you to breathe at night.leep apnea causes breathing interruptions during your sleep, and teeth grinding (which is called bruxism) can cause you to wake up during the night. Allergies, colds, coughing, and upper respiratory infections can make it difficult for you to breathe at night.