步骤1：找出网站，
步骤2：
wget -r -np http://www.physionet.org/physiobank/database/slpdb/
注意是http不是https
wget http://www.physionet.org/physiobank/database/sleep-edfx/sleep-cassette/SC4001E0-PSG.edf 下载单个文件
wget -r -np http://www.physionet.org/physiobank/database/apnea-ecg/
wget -r -np http://www.physionet.org/physiobank/database/slpdb/
wget -r -np http://www.physionet.org/physiobank/database/ucddb/
wget -r -np http://physionet.org/physiobank/database/capslpdb/
Probabilistic cardiac and respiratory based classification of sleep and apneic events in subjects with sleep apnea