The investigators will conduct a single-center case series study. A total of 40 participants with insomnia will be enrolled. The aim of the study is to assess the therapeutic effect of head-point acupuncture for the treatment of insomnia.

The investigators will conduct a single-center case series study. A total of 40 participants with insomnia will be enrolled, and will undergo GV20, EX-HN-1, GV21, GV22, GV23, GV24, GV29, and bilateral GB13 acupuncture treatment for 4 weeks.

The primary outcomes of therapeutic effect on insomnia are changes of the Pittsburgh Sleep Quality Index (PSQI), Epworth Sleepiness Scale (ESS), and the Hospital Anxiety and Depression Scale (HADS).The time frame of the three primary outcomes are: baseline week 0, week 2, week 4 and week 6.

The secondary outcomes of therapeutic effect on insomnia are sleep parameters including sleep efficiency (SE), sleep awakenings (SA) and total sleep time (TST) recorded by the actigraphy (time frame: baseline week 0, week 2, week 4 and week 6), as well as the heart rate viability(HRV) recorded by the ECG monitor (time frame: baseline week 0, week1, week 2, week 3, week 4 and week 6; and 30 minutes before and 60 minutes after acupuncture through study completion).

Inclusion Criteria:

1. aged 20~80 years,
2. met the diagnostic criteria of insomnia according to the Diagnostic and Statistical Manual of Mental Disorders (Fifth Edition, DSM-V)
3. experienced insomnia at least three times a week for more than a month
4. voluntarily agreed with the investigation and signed a written informed con- sent form before the clinical trial started.

Exclusion Criteria:

1. a pregnant or lactating woman
2. the patient's insomnia is caused by mental disorders other than mild anxiety,
3. the patient has serious cardiovascular, liver, kidney or hematopoietic system disease
4. the patient's insomnia is caused by nervous system disease (eg, stroke, Parkinson's Disease)
5. the patient has taken Chinese herbs and herbal formulas for insomnia two weeks before the trial
6. the patient with cardiac pacemaker
7. the patient does not want to wear portable physiological signal recording device (SOMNOwatchTM) and handheld ECG monitor
8. the patient has a history of sleep apnea

1. aged 20~80 years,
2. persistent difficulty in either falling asleep, remaining asleep through the night, or waking up too early at least three nights a week for more than a month, and not suffered from any secondary diseases.

There will be a research number representing the identity. This number will not display the name, identification number, and address.

For the results and diagnosis of the visit, the research host will maintain a confidential attitude and carefully maintain the privacy. If research results are published, the identity will remain confidential.

Please also understand that if the participant signs the consent form, the participant agrees that the visit record can be directly reviewed by the monitor, auditor, research ethics committee and the competent authority to ensure that the research process and data comply with relevant laws and regulations. These people also promise not to violate the confidentiality of your identity.